Factory Automation

MELSEC-F series Main Unit

FX PLC Main Unit

More freedom, more friendliness: FX

A wide lineup in FX series offers you many choices to fit to your budget and application.
You are sure to find a model that fulfills your needs.

FX Series Lineup
For high speed,
high functionality,
and expandability
Memory
64,000 step RAM memory built-in. Flash memory cassette can also be mounted.
Processing speed
Basic instruction: 0.065 μs/instruction (LD instruction) Application instruction: 0.642 to 100 μs/instruction
Device
Auxiliary relay: 7,680 pts Timer: 512 pts Counter: 235 pts Data register: 8,000 pts
Extension register: 32,768 pts Extension file register (optional memory): 32,768 pts
Application instruction
List of supported application instructions
Here
For high speed,
reduced wiring,
reduced space
Memory
64,000 step RAM memory built-in. Flash memory cassette can also be mounted.
Processing speed
Basic instruction: 0.065 μs/instruction (LD instruction) Application instruction: 0.642 to 100 μs/instruction
Device
Auxiliary relay: 7,680 pts Timer: 512 pts Counter: 235 pts Data register: 8,000 pts
Extension register: 32,768 pts Extension file register (optional memory): 32,768 pts
Application instruction
List of supported application instructions
Here
For communication,
analog expansions,
and up to 256 I/O control

To be discontinued
2026/12
Memory
32,000 step EEPROM memory built-in. Battery-free and maintenance-free.
Processing speed
Basic instruction: 0.21μs/instruction (in standard mode) 0.42 μs/instruction (in extension mode)
Application instruction: 0.5 to 100 μs/instruction (in standard mode) 1.2 to 100 μs/instruction (in extension mode)
Device
Auxiliary relay: 7,680 pts Timer: 320 pts Counter: 235 pts Data register: 8,000 pts
Extension register: 24,000 pts Extension file register: 24,000 pts
Application instruction
List of supported application instructions
Here

*1: 14 pt, 24 pt models can only connect 1 board
*2: 14 pt, 24 pt models have 2 independent axes
For reduced space and
reduced wiring

To be discontinued
2026/12
Memory
32,000 step EEPROM memory built-in. Battery-free and maintenance-free.
Processing speed
Basic instruction: 0.21 μs/instruction (in standard mode) 0.42 μs/instruction (in extension mode)
Application instruction: 0.5 to 100 μs/instruction (in standard mode) 1.2 to 100 μs/instruction (in extension mode)
Device
Auxiliary relay: 7,680 pts Timer: 320 pts Counter: 235 pts Data register: 8,000 pts
Extension register: 24,000 pts Extension file register: 24,000 pts
Application instruction
List of supported application instructions
Here
For communication,
analog expansions,
and low cost
Memory
16,000 step EEPROM memory built-in. Battery-free and maintenance-free.
(Program capacity is 4,000 steps)
Processing speed
Basic instruction: 0.21 μs/instruction
Application instruction: 0.5 to 100 μs/instruction
Device
Auxiliary relay: 1,536 pts Timer: 138 pts Counter: 67 pts Data register: 3,000 pts
Application instruction
List of supported application instructions
Here
Explanation of the icons
Depending on control points, total 256 I/O extension devices can be connected.
*Includes CC-Link remote I/O
FX3U/FX3UC can count at high speed input frequency 100 kHz (1-phase 6 pts), 50 kHz (2-phase 2 pts), 10 kHz (1-phase 2 pts).
Depending on control points, total 384 I/O extension devices can be connected.
*Includes CC-Link remote I/O
FX3S/FX3GC has 2 axes simple positioning function built into the main unit.
Depending on the purpose, various special function blocks can be connected.
FX3G/FX3U/FX3UC has 3 axes simple positioning built into the main unit.
*FX3G 14 pt, 24 pt models have independent 2 axes.
Function can be easily added by mounting a function expansion board to the main unit.
I/O can be connected in connector format, reducing wiring effort.
In FX3UC-32MT-LT, CC-Link/LT master functionality is built-in.
1 phase: 60 kHz x 4 pts/ 10 kHz x 2 pts    2 phase: 30 kHz x 2 pts/ 5 kHz 1 pt
1 phase: 60 kHz x 2 pts/ 10 kHz x 4 pts     2 phase: 30 kHz x 1 pt/ 5 kHz 1 pt
In FX3S-30MR/ES-2AD, FX3S-30MT/ES-2AD, and FX3S-30MT/ESS-2AD, 2 ch analog input (current input) function is built-in.